In the workshop I took a few years ago from Dave Vestal and Al Weber, they had us use split filtration while printing. We were required to expose some shots with extremes of shadow and highlight with high lighting ratios and then print straight, print split and print with dodging and burning.

The results were in the improving order, straight, straight d&b, split grade, split d&b. There is no question in my mind that split grade improves the quality of some prints and adding in some d&b gives even more control.